Good luck using old C# SDK code. You really should be using 6.0 of the SDK that came out this year. Otherwise, maybe you should contact the blog author for assistance to see if they have any ideas.
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DMCSMar 20 '12 at 18:52

1 Answer
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You need to include a valid access token in the request. Also, I would recommend upgrading to V6 of the Facebook C# SDK. For the version you are using though you need to pass the access token into the constructor of FacebookWebClient as follows: